Organics on soil aggregate fractions

Soil aggregates and organic matter are considered to be important indicators of soil quality. The objective of this review study was to determine agricultural practices effects on the distribution of soil organic carbon (SOC) associated with aggregate-size fractions. Depth distribution of soil organic carbon (SOC) fractions depends on the efficiency of agro‐ technical managements.

21p trinhthamhodang9 16-12-2020 7 2   Download

Studying the dynamics of soil organic carbon (SOC) is important for understanding the carbon stabilization into different pools. Thus, a 25-year old experiment was used to assess the impact of double rice cropping system with addition of organics and grades of fertilization on labile carbon pools and crop yield sustainability in an Inceptisol in southern India. The total water stable aggregates (WSA) in the experimental soils ranged from 70.4 to 94.9% under different treatments.

11p angicungduoc8 07-11-2020 14 1   Download

The review study assessed that the adoption of CA in rice-wheat system for a few uninterrupted years can substantially improves the organic carbon carbon status, and reduce the sub-surface compaction and the modified soil environment may promote rice-wheat system productivity in directseeded/ unpuddled transplanted rice and notill wheat system, in comparison to a conventional system, where rice was puddletransplanted followed by conventionally tilled wheat.

18p caygaocaolon7 18-09-2020 10 2   Download

The main objective of the present review study was to assess the impact of long-term manure and synthetic fertilization and residue retention on SOC storage, soil aggregation and responses of SOC fractions in the Typic Ustochept soil of Northwest India.

16p nguaconbaynhay7 15-08-2020 14 1   Download

The average concentration of particulate organic carbon (POC), dissolved organic carbon (DOC) and microbial biomass carbon (MBC) in organic manure plus inorganic fertilizer treatments (NP+S and NP+FYM) in 0–60 cm depth were increased by 64.9–91.9%, 42.5–56.9%, and 74.7–99.4%, respectively, over the CK treatment. Accumulation of crop residues and organic matter in the surface layer under conservation tillage creates favourable feeding conditions and also provides physical protection to various soil organisms, thereby increasing their abundance as well as diversity.

27p gaocaolon5 14-06-2020 21 3   Download

Understanding the process of soil organic carbon (SOC) sequestration and mineralization in aggregates is pertinent to mitigate climate change and minimize risks of soil degradation. The NT system increased the proportion of >2 mm aggregate fraction and reduced the proportion of 0.25 mm macro-aggregate fraction also significantly increased in the 0.00-0.5 m layer in NT system. However, those within the 2.00-0.25 mm aggregate fraction were significantly reduced in the 0.05-0.200 m layer under NT system.

20p chauchaungayxua4 18-03-2020 20 1   Download

Soil tillage can affect the stability and formation of soil aggregates by disrupting soil structure. Frequent tillage deteriorates soil structure and weakens soil aggregates, causing them to be susceptible to decay. Different types of tillage systems affect soil physical properties and organic matter content, in turn influencing the formation of aggregates. The objective of this review study was to evaluate the effect of tillage and fertilization on soil aggregates and associated organic carbon fractions to a subtropical soil and to identify the optimal conservation tillage in this system.

21p chauchaungayxua4 18-03-2020 13 1   Download

Tillage systems can changes in soil organic carbon dynamics and soil microbial biomass by changing aggregate formation and C distribution within the aggregate. However, the effects of tillage method or straw return on soil organic C (SOC) have showed inconsistent results in different soil/climate/ cropping systems. Soil TOC and labile organic C fractions contents were significantly affected by straw returns, and were higher under straw return treatments than non-straw return at three depths.

18p caygaocaolon2 14-03-2020 34 0   Download

Soil macro-aggregate turnover and micro-aggregate formation: A mechanism for C sequestration under notillage agriculture had its genesis in attempts to identify and isolate soil organic matter (SOM) fractions that reflect the impacts of climate, soil physiochemical properties and physical disturbance on the soil organic carbon balance. Soil tillage can affect the formation and stability of soil aggregates. The disruption of soil structure weakens soil aggregates to be susceptible to the external forces of water, wind, and traffic instantaneously, and over time.

20p caygaocaolon2 11-03-2020 18 1   Download

The influences of tillage systems on soil carbon (C) stocks have been studied extensively, but the distribution of soil C within aggregate fractions is not well understood. This review study was to determine the influences of various tillage systems on soil aggregation and aggregate-associated C under rice-wheat rotation in North India. The NT and RT treatments significantly increased the proportion of macro-aggregate fractions (>2000 and 250-2000μm) compared with the MP-R and MP+R treatments.

19p chauchaungayxua3 07-02-2020 16 0   Download

The content of WSAma with fractions 1-0.5 mm decreased with time. On the contrary, the content of WSAma with particle sizes above 5 mm increased with time in all treatments except the B10N2 and B20N2 treatments. A statistically significant trend was identified in the proportion of WSA in the B10N2 and B20N2 treatments, which indicates that biochar with higher application levels of N fertilizer stabilizes the proportion of water-stable aggregates.

12p meolep1 28-11-2018 39 1   Download